Eat enough of them, and the world will never be the same...


Choose One:

Mutagen. Reset a unit and Strengthen it by 3.

Toxicant. Reset a unit and Weaken it by 3.

Animated card

Note: For accurate card stats, see infobox to the right; the one below is for illustrative purposes only.

Witcher links

Patch changes

  • Gwent icon Gwent Update: Dec 19, 2017 Patch: Name change: Mushrooms (was Mardroeme). Replaced Spores artwork with the one already used by Mushrooms and Mutagen. Added Alchemy Tag.
  • Gwent icon Gwent Update: Oct 31, 2017 Patch: Mutagen will Heal, instead of Resetting a Unit. Removed Special Tag from Mutagen and Spores.
  • Gwent icon Gwent Update: Aug 29, 2017 Patch: Added Organic Tag to Mardroeme, Spores and Mutagen. General change; Doomed is no longer a tag, but an ability in card's description (applies to Spores and Mutagen).
  • Gwent icon Gwent Update: Jan 5, 2017 Patch: Fixed an exploit, using Mardroeme to get an auto-win after not choosing a target for the Mutagen card.